Neuron Circuit Using a Thyristor and Inter-Neuron Connection with Synaptic Device

Neuromorphic System;neuron Circuit;thyristor;synaptic device;SFST;뉴로모픽 시스템;뉴런 회로;사이리스터;시냅스 소자;실리콘 기반의 플로팅-바디 시냅스 소자;621

공과대학 전기·컴퓨터공학부 ;

University:서울대학교 대학원

关键词: Neuromorphic System;    neuron Circuit;    thyristor;    synaptic device;    SFST;    뉴로모픽 시스템;    뉴런 회로;    사이리스터;    시냅스 소자;    실리콘 기반의 플로팅-바디 시냅스 소자;    621;   

Others  :  http://s-space.snu.ac.kr/bitstream/10371/123086/1/000000020788.pdf

美国|英语

来源: Seoul National University Open Repository

【 摘 要 】

For around last two decades the field of neuromorphic engineering has put an endeavor to develop practical neuro-computing devices that mimicked the principles and operations of biological brains, by directly exploiting the physics of electronic devices in mixed analog/digital VLSI system. However, there always was a clamor for a compact electronic system that can mimic the neural network as close as possible. In this thesis, a simple and compact neuron circuit using a thyristor device has been proposed. The thyristor exhibits bi-stable characteristics when switched between high-impedance, low current OFF-state and low-impedance, high current ON-state with the help of assist circuit can mimic the action potential of the biological neuron. The circuit comprises of six transistor and one capacitor along with a thyristor making it area efficient to be implemented on the chip.In addition inter-neuron connection circuit with synaptic device has also been presented here. The silicon-based floating-body synaptic device (SFST) is used as synaptic device. The circuit utilizes both short-term and long-term plasticity of the synaptic device as current through the device to transfer it to the post-synaptic neuron. The circuit is capable to keep the conductance of the synaptic device unaffected by the change in input voltage of the post-synaptic neuron.